Chemotherapeutic compounds



Patented Dec. 23, 1952 UN ITED STATE S PATENT OFFICE CHEMOTHERAPEUTIC COMPOUNDS Erwin Schwenk and Bradley Whitman,.Montclair,

No Drawing. Application September 20, 1948, Serial No. 50,251"

7 Claims. 1

The invention relates to a new group of compounds having important chemotherapeutic activity. More specifically, the invention relates to new diaminodiphenylsulfone derivatives which are characterized by high bactericidal activity and a low oral toxicity.

A principal object of. thisinventlon is the provision of a group 01 diaminodiphenylsulfones characterized by a combination of phyical and chemical properties whereby aqueous solutions of the compounds may be secured. Furthermore, the new diaminodiphenyl sulfohes are especially efi'ective, since, unlike the sulfanilamides and most other sulfone derivatives, they are not antagonized by p-aminobenzcic acid; and, in addition, they have the unusual property of preventing the development of influenza virus and viruses of atypical pneumonia from propagating.

The new diaminodiphenylsulfone derivatives of the invention may be represented by the following general formula:

Hal

wherein Hal stands for chlorine, bromine or iodine, and derivatives thereof wherein at least one of the amino hydrogens is replaced by a water solubilizing group. Typical water solubilizing groups are CONH-naphthyl- (SOsNa) x, wherein a: is 1, 2 or 3, --CO-CH2-Y'-CHz-C02Na, wherein Y is O, S, S-S, S0 or S02.

-CONH- CsHs-NHCO-NH-naphthyi (SOaNa) wherein a: is 1, 2, 3, -CO-R-CO2Na wherein R is a divalent hydrocarbon radical, --CO-CH2-SO3Na, CH2-SCH2-COON3., SO2'naphthy1-(SOsNa)e,

wherein a: is 1, 2 or 3, :CH-CH-(SOsNah,

In the solubilizing groups other alkali and alkaline earth metal salts and organic amine salts may be used instead ofthe. sodium salts.

In the closely related sulfanilamide field it has been found thatv compounds containing metasubstituted amino groups almost without exception completely lack bactericidal activity. The

amino group in. any'positlon other than the paraposition renders the compounds of little clinical value. In general, nuclear substitution in the sulfanilamides also brings about a remarkable decrease in activity. Therefore, it was most unexpected that Where both the placing the amino group in other thanthe para-position and nuclear substitution were employed, activity of a high order should be found.

The compounds of the invention may be prepared by the nitration of the appropriately substitutedhalogenated diphenyl sulfone. For example, nitration. of 4,4-dichlorodiphenylsulfone readily yields the 3.3-dinitro derivative. Reduction. of the nitro group is readily accomplished by any of. the known methods. The resulting 3,3'-diamino-4,4'-dichlorodiphenylsulfone may then be converted by use of solubilizing groups heroine above-mentioned to compounds which are stable in aqueous solution. The following halogenated sulfones, which are. representative of typical starting compounds, can be converted to the desired diamino compounds: 2,2'-dichlorodiphenylsulfone, 2,4-dichlorodiphenylsulfone, 4,4- dibromodiphenylsulfone, and 4-bromo-4'chlorodiphenylsulfone.

The following,v examples are illustrative of the methods and compounds of the invention:

Example I The substance having the structural formula N'Hz is prepared as follows:

To 1 l. of H2804 is added 200 g. of 4,4d-dichlorodiphenylsulfone and the mixture warmed until solution has taken place. One 1. of yellow fuming nitric. acid is then slowly added with stirring and cooling. The reaction mixture is warmed for an hour on the steam. bath. The'reaction mixture is then cautiously added to ice and water and the product collected by filtration. After drying, thereis obtained 2509258 g. of. the dinitro product melting at. 199-201 C. which is sufficiently pure for. use in the-succeeding step.

The-nitro groups may be reduced to amino groups by any of the known methods, as for example by Raney nickel and hydrogen, or by heating with. stannous chloride in concentrated hydrochloric acid. The free base melts at 15849" C.

Example-II The substance having the structural formula NaOzSCHr-NH HNCHzSOzNB n c1 -01 H O is prepared as follows:.

A mixture of 15 g. of sodium formaldehydesulfoxylate and 16 g. of 4,4-dichloro-3,3'-diamino diphenylsulfone is added portionwise, with stirring, to 45 cc. of glacial acetic acid at room temperature. The bulk of the acetic acid is removed under vacuum. The residue is taken up in methanol and precipitated with ether. The precipitate is dissolved in 40 cc. of water and neutralized with sodium bicarbonate. After adding 300 cc. of methanol and 50 cc. of ether, the solution is filtered and the filtrate poured into ether. After chilling, the disodium sulfoxylate derivative is collected by filtration.

Example III The substance having the structural formula HN-R HN-R is prepared as follows:

The nitration of 4,4dibromodiphenylsulfone is carried out by the procedure of Example I and the resulting dinitro compound is reduced with hydrogen and Raney nickel catalyst at a pressure of three atmospheres. The 4,4'-dibromo- 3,3'-diaminodiphenylsulfone is then condensed in the known manner with cinnamaldehyde and sodium bisulfite.

Example IV The substances having the structural formula BEN c1 01 NHR BEN NHR RHN 01 01 NHR Hal I wherein Hal is a halogen selected from the group consisting of chlorine and bromine and R is a member of the group consisting of CHzSOzNa,

and COCH2CH2CO2NH2(CH2CH2OH) 2. 2. Compounds of the general formula NHR NHR

wherein R is a member of the group consisting Of CHzSOzNa,

(FHz-CHz-CHa-Cafl SOaNa OaNa and COCH2CH2CO2NH2(CH2CH2OH) 2.

3. New substances of the general formula Ha! I- Hal NH R

wherein Hal represents halogen and R represents CHzSOzNa.

4. New substances of the general formula NH R Hal

I SiO2 wherein Hal represents halogen and R represents CH-ClL-CH-Cdh OzNa OaNa 5. New substances of the general formula NH R Hal

Hal

NH R

wherein Hal represents halogen and R represents COCHzCHzCOzNHz- (CHzCHzOH) 2.

6. The substance of the formula NHCHzSOzNa 7. The substance of the formula ERWIN SCHWENK.

BRADLEY WHITMAN.

REFERENCES CITED The following references are of record in the file of this patent:

OTHER REFERENCES Martinet, Compte Rend. de IAcademic des Sciences, Vol. 173, p. 777 (1921) Machek et al., J. Crak Chem, vol. 160, pages 41-64 (1940).

Iris et a1., Rev. Inst. Salubridad Enfermedad Trop. (Mex) v01. 5, pages -81 (1944).

Friedlander, Proc. Soc. Exptl. Biol. Med., vol. 63 (1946), pp. 361-364.

Lorenz, Fiat #18 of German Science Chemotherapy. pages 277-279. 

1. COMPOUNDS OF THE GENERAL FORMULA 